On page 248 of The Chaffee Genealogy there is the following about Benjamin Chaffee Jr.:
"...was born in Becket, Mass., february 11, 1792 (1793), and died in Newfield, N.Y., June 30 1842.He married in Scipio, N.Y., in 1812, Clarissa, daughter of Robert Bradford of Sempronius, N.Y.She was born February 17, 1798, died December 24 1862, and was buried in North Hector, N.Y.She was a Methodist.
Benjamin Chaffee, Jr., was a Private in the War of 1812.He travelled as far as Black Rock, N.Y., but did not engage in any active service.
He was baptized in Novermber, 1793, in the First Congregational Church of Becket.He probably went to New York state with his father, about 1807.At the time of his marriage he was living in Scipio, but apparently moved soon after to Newfield, as all his children were born there.He had a fair complexion, gray eyes, and was five feet, eight inches in height.He was a farmer and is said to have been a strict and upright man.
Children, born in Newfield:
i Clarissa Ervilla Chaffee, boorn March 13, 1813; married John Mc Daniels
ii Benjamin Albert Chaffee, born November 11, 1814; married (1) Caroline Story; (2) Mary Conley
iii Robert Charles Chaffee, born May 22, 1816 (1) Sophia Russel; (2) Ann Shields
iv Ezra Albertus Chaffee, born June 24, 1819; married Sally Gellow
v Sarah Alvira Chaffee, born July 5, 1820; married William Rowley
vi Samuel Chaffee, born March 2, 1822; died in Newfield, May 10, 1840
vii Jane Mirah Chaffee, born May 9, 1824; married Richard or John Russel.
viii Rufus Chaffee, born August 14, 1826; married (1) Eliza Beach; (2) Maries Starks
ix Andrew Chaffee, born July 31, 1828; Married Marietta Beach; (2) Maria L. Dassance.
x Mary Ann Chaffee, born July 23, 1830; died in Indiana, April 15, 1870; married Jeremiah Beach; lived in Newfield until 1863, when she moved to Indiana
xi Nelson Chaffee, born September 20, 1832; died November 4, 1864;married Alvira Chaffee; went to Indiana from Neewfield in 1851, and livedd there until 1863, when he entered the Union Army and died in the Civil War.
xii Lemuel Chaffee, born June 16, 1834; died in Newfield, in childhood
xiii Chloe Melissa Chaffee, born March 21, 1837; died in Indiana in 1858; married Job Smitth; went to Indiana from Newfield with her brother in 1851.
That is the data on Benjamin born in 1792.I'm not sure how this fits in to your line.
Perhaps you can provide a fe3w more specifics about your grandfather such as date of birth etc.
Paul V. Chaffee